My TPU is not cooperating today.  More precisely, I've blown away all my Cura settings and I don't want to take the time to dial it in again.

I think I have a better idea anyway.

Difficult to explain, but it gives me better mechanical advantage in that I'm now opening the rose with the servo instead of closing it.  This also allows the stem leaves or a braiding band to be the spring which closes it.  Ultimately simpler.  Simple is good

Experimented with bending the petals.

Turned the heated bed up to 85C and let them sit on it, then pressed them against a light bulb.

Mostly worked, but not good enough.  I need them to curve in two dimensions and I'm not getting them hot enough to smooth out.  Perhaps the toaster oven... or turn the light bulb on.  :)